Battery pack internal micro-short circuit electric fault on-line detection device

Abstract

The application relates to the technical field of electric measurement and fault diagnosis, in particular to a battery pack internal micro-short circuit electric fault online detection device. The device comprises a host module and a collection module connected with the host module through a communication line, the collection module is connected with the positive and negative poles of a battery pack through a collection line, a joystick and a clamping mechanism are arranged on the collection module, the joystick is slidably arranged around the collection module through a limiting assembly, the communication line is controlled through the joystick, since the end of the joystick is close to the side wall of the vehicle body, the communication between the communication line and the communication port of the collection module can be controlled through the joystick without prolonging the communication line. Moreover, the sliding of the joystick also controls the operation of an electromagnet, so that the stability of the connection between the communication line and the communication port of the collection module in the non-repair state is ensured.

Description

Technical Field

[0001] This invention relates to the field of electrical measurement and fault diagnosis technology, and more specifically, to an online detection device for micro short-circuit electrical faults inside a battery pack. Background Technology

[0002] In modern trains, high-voltage power battery packs (such as those used in hybrid locomotives, auxiliary power supply for EMU trains, and emergency traction) and low-voltage auxiliary battery packs (such as those used in control, lighting, and safety systems) are core energy storage components that ensure the safe operation and functional integrity of trains. Due to their insidious nature, gradual deterioration, and the high risk of eventually causing thermal runaway, micro-short circuit faults within battery packs have become a core challenge for the safety management of power batteries in the rail transit sector.

[0003] Currently, online detection devices are mainly used to collect voltage, current, and temperature data of battery packs to detect micro-short circuits inside the battery packs. The online detection device mainly consists of a host module and acquisition modules. The number of acquisition modules corresponds to the number of battery packs and is used to collect data from each battery pack. Multiple acquisition modules are linearly connected to a host module via communication, enabling comprehensive detection and management.

[0004] However, in online battery pack detection devices used on trains, the battery packs need to be periodically moved out of the train along guide rails for inspection and maintenance, resulting in relative displacement. This process exerts continuous tensile stress on the communication cables between the fixedly connected acquisition module and the host module. If the cables are simply extended to accommodate the displacement, the redundant cables are difficult to neatly store and secure in the confined space after the battery pack is reset, easily leading to loosening, tangling, or wear. If the cables are not extended, maintenance personnel must enter the train to plug and unplug the cables each time, which is difficult to do due to the limited space inside the train. Summary of the Invention

[0005] The purpose of this invention is to provide an online detection device for micro short-circuit electrical faults inside a battery pack. This device uses a joystick to control the communication line, thereby solving the problem mentioned in the background art, namely, that without extending the cable, maintenance personnel need to enter the train to plug and unplug the cable each time, which is difficult to do due to the small space inside the train.

[0006] To achieve the above objectives, the online detection device for micro short-circuit electrical faults inside a battery pack includes a host module and a data acquisition module connected to the host module via a communication line. The data acquisition module is connected to the positive and negative terminals of the battery pack via a data acquisition line. The data acquisition module is equipped with a joystick and a clamping mechanism.

[0007] The joystick is positioned around the acquisition module by means of a sliding limit component;

[0008] The clamping mechanism is located at the communication port of the acquisition module and is fixedly connected to the end of the communication line, which is used to restrict the end of the communication line to the front of the communication port of the acquisition module.

[0009] The clamping mechanism is connected to one end of the control lever. During maintenance, the position of the control lever is adjusted by pushing and pulling, so that the control lever drives the communication line into or out of the communication port of the acquisition module through the clamping mechanism.

[0010] It also includes a locking element, which is used to restrict the communication line within the communication port of the acquisition module by limiting the displacement of the clamping mechanism when the joystick is in a non-push-pull state.

[0011] Based on this, one end of the control lever slides through the clamping mechanism, and the outer ring of the control lever is provided with stops on both sides of the clamping mechanism;

[0012] The distance between the two stops is greater than the width of the clamping plate, which is used to drive the clamping mechanism to move after the control lever has moved a predetermined distance.

[0013] The locking mechanism includes an electromagnet, a piston rod, and two conductive arms fixed to the side wall of the acquisition module, wherein:

[0014] The piston rod is slidably disposed inside the coil inside the electromagnet, and a resilient element for resetting is provided between one end of the piston rod and the electromagnet.

[0015] The two conductive arms are positioned at the same height and are in a non-contact state, with one connected to an electromagnet and the other connected to a power source;

[0016] One end of the conductive arm is provided with a protrusion, and a conductive plate is provided below the stop at the end of the control lever. The bottom of the conductive plate is higher than the surface height of the conductive arm and lower than or equal to the surface height of the protrusion. When the conductive plate contacts the protrusion, the electromagnet is energized, causing the piston rod to disengage from the movement path of the stop plate installed at the bottom of the clamping plate.

[0017] The detection device of this invention controls the communication line via a joystick. Since the end of the joystick is close to the side wall of the vehicle body, maintenance personnel can control the connection between the communication line and the communication port of the acquisition module simply by using the joystick without extending the communication line. Furthermore, the sliding of the joystick also controls the operation of the electromagnet, ensuring the stability of the connection between the communication line and the communication port of the acquisition module in non-maintenance states. Attached Figure Description

[0018] Figure 1 This is a schematic diagram showing the arrangement of existing detection devices.

[0019] Figure 2This is a schematic diagram of the control lever of the present invention;

[0020] Figure 3 This is a schematic diagram of the acquisition module of the present invention;

[0021] Figure 4 This is a schematic diagram of the electromagnet of the present invention;

[0022] Figure 5 This is a schematic diagram of the clamping mechanism of the present invention;

[0023] Figure 6 This is a schematic diagram of the clamping mechanism and the control lever of the present invention;

[0024] Figure 7 This is a schematic diagram of the conductive arm of the present invention;

[0025] Figure 8 This is a schematic diagram of the operating state of the joystick of the present invention. Figure 1 ;

[0026] Figure 9 This is a schematic diagram of the operating state of the joystick of the present invention. Figure 2 ;

[0027] Figure 10 This is a schematic diagram of the baffle of the present invention.

[0028] The meanings of the labels in the diagram are as follows:

[0029] 100. Main unit module; 101. Communication line; 200. Acquisition module; 201. Acquisition line; 202. Slide rail; 203. Groove; 204. Guide port; 205. Guide ring; 206. Guide pin; 210. Control lever; 211. Stop block; 212. Conductive sheet; 220. Clamping mechanism; 221. Perforation; 222. Clamping plate; 223. Clamping groove; 224. Bolt; 225. Hook; 226. Baffle; 227. Inclined surface; 230. Electromagnet; 231. Piston rod; 232. Conductive arm; 233. Protrusion; 300. Battery pack; 301. Guide rail; 400. Vehicle body. Detailed Implementation

[0030] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0032] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0033] Locomotives, such as trains, typically have internal detection devices to monitor for micro-short-circuit electrical faults within the battery pack 300. For example... Figure 1 As shown, the detection device consists of a main unit module 100 and a data acquisition module 200, in order to... Figure 1 Taking three battery packs 300 as an example, the number of acquisition modules 200 is also set to three. Each acquisition module 200 is connected to the positive and negative terminals of the battery pack 300 via an acquisition line 201, thereby monitoring data such as current and voltage of the battery pack 300. During wiring, a communication line 101 is led out from the communication port of the host module 100. This communication line 101 is first connected to the communication input port of the first acquisition module 200. Then, a cable is led out from the communication output port of this acquisition module 200 and connected to the communication input port of the second acquisition module 200. This process continues in series until the last module.

[0034] When the battery pack 300 needs regular inspection and maintenance, such as Figure 2 As shown, the battery pack 300 is pushed to the right side of the vehicle body 400 (right side is outside the vehicle, left side is inside the vehicle) via the guide rail 301. At this time, the battery pack 300 moves to the outside of the vehicle, while the main unit module 100 is located inside the vehicle, resulting in an increased distance between the two. To prevent the communication line 101 between the acquisition module 200 and the main unit module 100 from being pulled, a joystick 210 and a clamping mechanism 220 are provided on the acquisition module 200.

[0035] like Figure 3 As shown, one end of the joystick 210 slides through the acquisition module 200, and the other end faces the width direction of the vehicle body 400 (i.e., Figure 2Extending from the left and right sides of the vehicle body to the 400 side wall, it provides access for maintenance personnel located on the 400 side wall of the vehicle body. For example... Figure 5 As shown, the clamping mechanism 220 is fixedly connected to the end of the communication cable 101, and the clamping mechanism 220 is located at the communication port of the acquisition module 200, used to restrict the end of the communication cable 101 to the front of the communication port of the acquisition module 200. Additionally, the clamping mechanism 220 is connected to one end of the control lever 210. During maintenance, the position of the control lever 210 is adjusted by pushing and pulling, allowing the control lever 210 to drive the communication cable 101 into or out of the communication port of the acquisition module 200 via the clamping mechanism 220. Furthermore, a locking element is included, used to restrict the displacement of the clamping mechanism 220 and confine the communication cable 101 within the communication port of the acquisition module 200 when the control lever 210 is in a non-pulled state.

[0036] Specifically, the battery pack 300 is typically configured in a matrix. (See reference) Figure 2 The acquisition module 200, which is connected to the communication line 101, is usually located on the far left (i.e., Figure 2 There is a labeled acquisition module 200, and the length of the control lever 210 needs to extend to the side wall of the vehicle body 400 to allow maintenance personnel to perform push and pull operations. To ensure that the control lever 210 undergoes non-axial movement during the push and pull process, on the one hand, refer to... Figure 4 A through-slide rail 202 is provided on the side wall of the acquisition module 200, through which the joystick 210 passes, and the joystick 210 is restricted by the slide rail 202. On the other hand, for the battery pack 300 arranged in a matrix, first refer to Figure 3 By fixing the acquisition module 200 to the top of the battery pack 300 using methods such as adhesive bonding or threaded connection, and by providing a slide rail 202 within each acquisition module 200, the control lever 210 passes through the slide rail 202 within each acquisition module 200, achieving the following effect: Figure 2 As shown, this ensures that the acquisition module 200 can only perform axial displacement. Meanwhile, the joystick 210 adopts a polygonal columnar structure to prevent rotation.

[0037] Without departing from the scope of innovation of this invention, the joystick 210 can also be slidably disposed outside the acquisition module 200. For example, a base can be added to one side of the acquisition module 200, with a slide rail 202 running through the inside of the base. This method is suitable for retrofitting old acquisition modules 200, using the added base to support the sliding connection between the joystick 210 and the acquisition module 200.

[0038] like Figure 6As shown, the clamping mechanism 220 consists of two clamping plates 222 arranged vertically, both horizontally. This design secures one end of each clamping plate 222 to form a "U" shape. Because the clamping plates 222 are relatively thin, they are deformable. The clamping plates 222 can be made of metal or plastic. By providing clamping grooves 223 and hooks 225 on the opposite surfaces of the two clamping plates 222 that are adapted to the shape of the end of the communication cable 101, when fixing is required, the end of the communication cable 101 is placed in the clamping groove 223. Then, by pressing the two clamping plates 222, the clamping plates 222 clamp the end of the communication cable 101, while the hooks 225 engage with the end of the communication cable 101, thus achieving the fixation of the communication cable 101. On the other hand, the width direction of the clamping plate 222 is consistent with the length direction of the control lever 210. The control lever 210 is connected to one end of the clamping plate 222. When the control lever 210 drives the clamping plate 222 to move axially, this width design can prevent the clamping plate 222 from deforming in the length direction of the control lever 210.

[0039] Figure 6 The diagram also shows a structure for pressing the clamping plate 222. As shown, bolts 224 are provided on both sides of the clamping plate 222 located in the clamping groove 223, and the two clamping plates 222 are connected by bolts 224. When clamping the communication line 101, by tightening the bolts 224, when the bottom end of the bolts 224 contacts the other clamping plate 222, the bolts 224, under the action of the spiral, drive the bottom clamping plate 222 to move slightly upward, thus completing the clamping of the communication line 101. Alternatively, a "U"-shaped frame can be provided outside the clamping plate 222, with the two bends of the "U"-shaped frame located outside the clamping plate 222. Bolts 224 are provided on the top of the "U"-shaped frame and are threadedly connected to the "U"-shaped frame. During the tightening of the bolts 224, the bolts 224 move downward and press the top clamping plate 222, which can also achieve the clamping and fixing of the communication line 101.

[0040] During maintenance, the maintenance personnel push the control lever 210, which moves the clamping mechanism 220 away from the data acquisition module 200. At this time, the communication cable 101 is disconnected from the communication port of the data acquisition module 200. After maintenance is completed, the control lever 210 is pulled, which moves the clamping mechanism 220 closer to the data acquisition module 200. At this time, the communication cable 101 enters the communication port of the data acquisition module 200. During this process, if... Figure 4As shown, the present invention also provides a guide port 204 and a guide ring 205 on the outer wall of the acquisition module 200 to guide the communication line 101. Both the guide port 204 and the guide ring 205 are inclined inward. In this way, when the clamping mechanism 220 approaches the acquisition module 200, the guide pin 206 provided on the side wall of the clamping mechanism 220 will contact the guide port 204. When the guide pin 206 and the guide port 204 are not coaxial, the inclined structure at the entrance of the guide port 204 will adjust the position of the clamping mechanism 220 through the guide pin 206. At the same time, when the end of the communication line 101 approaches the guide ring 205, the inclined structure on the surface of the guide ring 205 also guides the communication line 101 to enter.

[0041] However, to prevent the communication line 101 from detaching from the communication port of the acquisition module 200 during train operation, a sliding connection is preferably used between the control lever 210 and the clamping mechanism 220. The specific structure is as follows: Figure 6 As shown:

[0042] First, the through holes 221 at the connection of the ends of the two clamping plates 222 allow the control lever 210 to slide through. The inner ring of the through holes 221 fits against the outer ring of the control lever 210, preventing the control lever 210 from making non-axial movements. Second, two stops 211 are provided on the outer ring of the end of the control lever 210 near the clamping mechanism 220 (the end of the acquisition module 200 corresponding to the groove 203 is provided with a groove 203 to allow the acquisition line 201 to enter, so as to avoid affecting the movement of the control lever 210). One of the stops 211 is installed at the end of the control lever 210 in a detachable manner (e.g., by screw connection). After the control lever 210 passes through the through holes 221, the end stop 211 is installed. At this time, the two stops 211 are located on both sides of the clamping plate 222. Furthermore, the distance between the two stops 211 is greater than the width of the clamping plate 222, so the clamping plate 222 can slide between the two stops 211. The purpose of this sliding is to allow the lever 210 to drive the locking member to restrict the clamping plate 222.

[0043] Specifically, the locking mechanism mainly consists of an electromagnet 230 fixed to the side wall of the acquisition module 200, a piston rod 231, and two conductive arms 232. The piston rod 231 is slidably disposed inside the coil within the electromagnet 230, and a spring for resetting is provided at one end between it and the electromagnet 230. When the electromagnet 230 is energized, the coil generates an attractive force that pulls the piston rod 231, causing the piston rod 231 to move... Figure 4 The electromagnet 230 moves to the left, thus disengaging from the movement path of the baffle 226 installed at the bottom of the clamping plate 222. When the electromagnet 230 is de-energized, the piston rod 231 is reset by the spring and enters the movement path of the baffle 226, thereby restricting the movement of the clamping mechanism 220. The energization and de-energization of the electromagnet 230 are mainly controlled by the operating lever 210.

[0044] Two conductive arms 232 are positioned at the same height and are in a non-contact state. One arm is connected to the electromagnet 230, and the other is connected to a power source (either a battery pack 300 or the power source of the acquisition module 200). Figure 7 As shown, one end of the conductive arm 232 is provided with a protrusion 233, and a conductive plate 212 is provided below the stop block 211 at the end of the control lever 210. The conductive plate 212 is simultaneously above both conductive arms 232, and the bottom height of the conductive plate 212 is higher than the surface height of the conductive arm 232 and lower than or equal to the surface height of the protrusion 233. When the conductive plate 212 contacts the protrusion 233, the electromagnet 230 is energized.

[0045] It should be noted that when the communication line 101 enters the communication port of the acquisition module 200, a relatively long distance can be set between the conductive sheet 212 and the protrusion 233 to avoid accidental contact between the conductive sheet 212 and the protrusion 233.

[0046] The working principle of this invention will be described in detail below:

[0047] First, such as Figure 8 As shown in the upper part, before maintenance, the conductive sheet 212 did not contact the conductive arm 232. At this time, the electromagnet 230 was de-energized, and the piston rod 231 extended in front of the baffle 226, causing the clamping mechanism 220 to be unable to drive the communication line 101 away from the communication port of the acquisition module 200. Figure 8 As shown in the middle section, during maintenance, pushing the control lever 210 in the direction of the arrow will cause the lever 210 to move on its own, without pushing the clamping mechanism 220, because the distance between the two stops 211 is greater than the width of the clamping mechanism 220. The movement of the control lever 210 causes the conductive plate 212 to contact the protrusion 233. At this time, the two conductive arms 232 are connected through the piston rod 231, and current is transmitted to the electromagnet 230, energizing it. At this time, the piston rod 231 will not obstruct the baffle 226. Figure 8 As shown in the lower part, continue to push the joystick 210. The joystick 210 drives the clamping mechanism 220 to move through the stop block 211. The movement of the clamping mechanism 220 causes the communication line 101 to disconnect from the communication port of the acquisition module 200.

[0048] Next, the battery pack 300 is pushed to the right side of the vehicle body 400 via the guide rail 301. At this time, the communication line 101 has been disconnected from the acquisition module 200, so there will be no pulling phenomenon.

[0049] After maintenance is completed, the battery pack 300 is reset. At this time, the positional relationship between the acquisition module 200 and the clamping mechanism 220 is as follows: Figure 9 As shown in the upper part. Next, refer to... Figure 9As shown in the middle part, pulling the control lever 210 in the direction of the arrow causes the control lever 210 to move on its own. When the through hole 221 at the end of the clamping mechanism 220 is on the side wall of the clamping mechanism 220, the control lever 210 drives the clamping mechanism 220 to move. (Reference) Figure 9 As shown in the lower part, during the displacement process, the conductive sheet 212 first contacts the protrusion 233. At this time, the electromagnet 230 is energized, and the piston rod 231 is disengaged from the movement path of the baffle 226. After the baffle 226 passes the piston rod 231, the conductive sheet 212 disengages from the protrusion 233. At this time, the conductive arm 232 continues to restrict the clamping mechanism 220.

[0050] Furthermore, during the resetting process of the clamping mechanism 220 driven by the lever 210, another method can be used to allow the baffle 226 to pass through the piston rod 231. For example... Figure 10 As shown, by tilting the side of the baffle 226 closest to the acquisition module 200, a slope 227 is formed on that side. Thus, when the baffle 226 contacts the piston rod 231, the slope 227 guides the piston rod 231 to move, allowing it to pass over the piston rod 231. After passing over, the piston rod 231 is returned to its original position by a spring, thus restricting the clamping mechanism 220.

[0051] In summary, this invention uses a joystick 210 to control the communication line 101. Since the end of the joystick 210 is close to the side wall of the vehicle body 400, maintenance personnel can control the connection between the communication line 101 and the communication port of the acquisition module 200 simply by using the joystick 210 without extending the communication line 101. Furthermore, the sliding of the joystick 210 also controls the operation of the electromagnet 230, ensuring the stability of the connection between the communication line 101 and the communication port of the acquisition module 200 in non-maintenance situations.

[0052] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A battery pack internal micro-short circuit electric fault on-line detection device, comprising a host module (100) and a collection module (200) connected with the host module (100) through a communication line (101), the collection module (200) is connected with the positive and negative poles of a battery pack (300) through a collection line (201), characterized in that, The collecting module (200) is provided with a joystick (210) and a clamping mechanism (220); The joystick (210) is slidably arranged around the collecting module (200) through a limiting assembly; The clamping mechanism (220) is located at a communication port of the collecting module (200) and is fixedly connected with an end of the communication line (101), and is used for limiting the end of the communication line (101) in front of the communication port of the collecting module (200); The clamping mechanism (220) is connected with one end of the joystick (210), and in the maintenance process, the position of the joystick (210) is adjusted by pushing and pulling, so that the joystick (210) drives the communication line (101) to enter or leave the communication port of the collecting module (200) through the clamping mechanism (220); Further comprising a locking member, which is used for limiting the displacement of the clamping mechanism (220) when the joystick (210) is in a non-pushing and pulling state, so as to limit the communication line (101) in the communication port of the collecting module (200); The clamping mechanism (220) comprises two clamping plates (222) connected with each other at one end, and a clamping groove (223) which is matched with the shape of the end of the communication line (101) is arranged between the two clamping plates; Further comprising a pressing mechanism for pressing the two clamping plates (222) to move close to each other to fix the end of the communication line (101); One end of the joystick (210) slidably penetrates the clamping mechanism (220), and the outer circle of the joystick (210) is provided with a stop block (211) on both sides of the clamping mechanism (220); The distance between the two stop blocks (211) is greater than the width of the clamping plate (222), which is used to drive the clamping mechanism (220) to move after the joystick (210) moves a predetermined distance; The locking member comprises an electromagnet (230) fixed on the side wall of the collecting module (200), a piston rod (231), and two conductive arms (232), wherein: The piston rod (231) is slidably arranged inside the coil of the electromagnet (230), and one end is provided with an elastic member for resetting between the electromagnet (230); The two conductive arms (232) are arranged at the same height and are in a non-contact state, one of which is connected with the electromagnet (230) and the other is connected with the power supply; One end of the conductive arm (232) is provided with a protrusion (233), and the stop block (211) at the end of the joystick (210) is provided with a conductive sheet (212) below, the bottom end of the conductive sheet (212) is higher than the surface height of the conductive arm (232) and lower than or equal to the surface height of the protrusion (233), when the conductive sheet (212) contacts the protrusion (233), the electromagnet (230) is powered on, so that the piston rod (231) is out of the movement path of the baffle (226) installed at the bottom of the clamping plate (222).

2. The battery pack internal micro-short circuit electric fault on-line detection device according to claim 1, characterized in that, The limiting assembly is a slide (202), one end of the joystick (210) slidably penetrates the slide (202), and the other end extends to the side wall of the vehicle body (400) in the width direction of the vehicle body (400), which is used for the maintenance personnel located on the side wall of the vehicle body (400) to operate.

3. The battery pack internal micro-short circuit electric fault on-line detection device according to claim 2, characterized in that, The slide (202) is arranged inside or on one side of the collection module (200).

4. The battery pack internal micro-short circuit electric fault on-line detection device according to claim 2, characterized in that, The joystick (210) is a polygonal column structure, the shape of the slide (202) is matched with the shape of the joystick (210), and the rotation of the joystick (210) is limited.

5. The battery pack internal micro-short circuit electric fault on-line detection device according to claim 1, characterized in that, The pressing mechanism comprises bolts (224) arranged on both sides of the clamping groove (223), the bolts (224) are threadedly connected with two clamping plates (222), and the two clamping plates (222) are driven to move close to each other by the screwing force.

6. The battery pack internal micro-short circuit electric fault on-line detection device according to claim 1, characterized in that, The outer wall of the collection module (200) is provided with a guide opening (204) and a guide ring (205), the guide opening (204) and the guide ring (205) are inclined towards the inside, and the side wall of the clamping mechanism (220) is provided with a guide needle (206).

7. The battery pack internal micro-short circuit electric fault on-line detection device according to claim 1, characterized in that, The side of the baffle (226) close to the collection module (200) is provided with an inclined surface (227), when the baffle (226) moves towards the collection module (200), the inclined surface (227) on one side of the baffle (226) guides the movement of the piston rod (231), so that the piston rod (231) is moved.

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